Powertrain Management (LEA)
DTC P2444 (LEA)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P2444
-
Secondary Air Injection System Pump Stuck ON
Diagnostic Fault Information
Circuit/System Description
The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. A pressure sensor is used to monitor the air flow from the secondary air injection pump. The engine control module (ECM) supplies voltage to the 5-volt reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.
Ignition voltage is supplied to the secondary air injection pump and air injection solenoid valve relays. The ECM controls the relays by grounding the control circuits, which activates the relays. When the relay contacts close, voltage is supplied to the pump and the solenoid valve, which turns the pump on and opens the solenoid valve.
The diagnostic uses 3 phases to test the secondary air injection system as follows:
* DTCs P0411 and P2430 run during Phase 1
* DTCs P2430 and P2440 run during Phase 2
* DTC P2444 runs during Phase 3
During phase 1, both the secondary air injection pump and the secondary air injection solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-15 kPa (1.2-2.2 psi) above BARO.
During phase 2, only the secondary air injection pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 15-22 kPa (2.2-3.2 psi) above BARO.
During phase 3, neither the secondary air injection pump nor the secondary air injection solenoid valve is activated. Secondary air injection pump deactivation is tested. Expected system pressure equals BARO.
Conditions for Running the DTC
* DTC P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0128, P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0280, P0282, P0283, P0300, P0301, P0302, P0303, P0304, P0351, P0352, P0353, P0354, P0412, P0418, P0420, P0606, P0641, P0651, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2227, P2228, P2229, P2230, P2430, P2431, P2432, or P2433 is not set.
* Greater than 30 min has elapsed since the last cold start.
* The ignition voltage is between 10-32 V.
* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).
* The engine coolant temperature (ECT) is between -11 to +56°C (12-133°F).
* The intake air temperature (IAT) is greater than -11°C (+12°F).
* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
* The engine speed is less than 5,000 RPM.
* The mass air flow (MAF) is less than 50 g/s.
* The AIR system is commanded ON.
* The DTC runs continuously once the above conditions are met for greater than 4 s.
Conditions for Setting the DTC
The ECM detects that the Secondary Air System pressure is greater than expected for greater than 4 s.
Action Taken When the DTC Sets
DTC P2444 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2444 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (LEA) [1][2]Electrical DiagramsEngine Controls Schematics (LUK) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Secondary Air Injection System Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON, compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table. The BARO pressure should be within the specified range displayed in the table for the specific altitude.
• If not within the specified range, refer to DTC P2227-P2230 P2227 for further diagnosis
2. Ignition ON, compare the scan tool Secondary Air Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
• If greater than the specified range, refer to DTC P2430-P2433 (LEA) Powertrain Management (LEA)DTC P2430-P2433 (LAF, LUK) Powertrain Management (LAF, LUK).
3. Command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. You should hear and feel a click as the relay is commanded ON and OFF.
• If the relay does not respond to the scan tool commands, refer to DTC P0412 or P0418 P0412 for further diagnosis.
4. Ignition ON, command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. The Secondary Air Pump should turn ON and OFF in response to the scan tool commands.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the G21 Secondary Air Injection Pump.
2. Ignition ON, verify that a test lamp does not illuminate between the G21 Secondary Air Injection Pump ignition voltage circuit terminal A and ground.
• If the test lamp illuminates, test the ignition circuit for a short to voltage.
3. If the circuit tests normal replace the KR25 Secondary Air Injection Pump Relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)